useful in determining heating energy requirements. Defined as (65 - MT)= HDD,where MT is Mean Temperature (F). If MT is greater than 65 degrees F, HDD=0. MT= Mean (average)Temperature of the day. MT=(High Temperature+Low Temperature)/2
HEATING DEGREE DAY (HDD)
Meaning of HEATING DEGREE DAY (HDD) in English
Weather and meteorology English vocabulary. Английский словарь погоды и метеорологии . 2012